Montreal RESSO_ Worlds Largest Underground Network

Welcome to the world's largest network, 1.5 million kilometers of interconnected tunnels. The story of the underground city in Montréal is unique in the world. It is one of our Seven Wonders of the Modern World. This video gives us an overview The Underground City was designed by a talented French architect named Jean-Claude Desjardins, who graduated from the École Polytechnique in Paris in 1951.